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1. React JS Training
Master the fundamentals of React JS
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2. Table of
Contents
01 Introduction to React JS
02 JSX
03 Components
04 State and Props
05 Lifecycle Methods
06 Routing with React Router
07 Styling in React
08 State Management with Redux
09 Testing React Applications

3. 3
Introduction to React JS
What is React JS?
• React JS is a JavaScript library for building user
interfaces.
• It allows developers to create reusable UI components.
• React JS follows a component-based architecture.
• It was developed by Facebook.
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4. 4
JSX
What is JSX?
• JSX is a syntax extension for JavaScript.
• It allows you to write HTML-like code in your JavaScript
files.
• JSX is used to define the structure of React components.
• It gets compiled to JavaScript by Babel.
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5. 5
Components
What are Components?
• Components are the building blocks of React
applications.
• They can be either functional or class-based.
• Components accept inputs called props.
• Components can have their own state.
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6. 6
State and Props
Managing Data in React
• State is a JavaScript object that stores component data.
• Props are inputs to components that are passed from
parent components.
• State and props are used to manage data and re-render
components.
• State is mutable, while props are read-only.
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7. 7
Lifecycle Methods
Controlling the Component Lifecycle
• Lifecycle methods are methods that get called at different
stages of a component's lifecycle.
• Some common lifecycle methods are
componentDidMount, componentDidUpdate, and
componentWillUnmount.
• Lifecycle methods allow you to perform actions at
specific points in a component's lifecycle.
• They are useful for fetching data, setting up
subscriptions, and cleaning up resources.
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8. 8
Routing with React
Router
Navigation in Single-Page
Applications
• React Router is a popular library for client-side routing in
React applications.
• It allows you to create routes and navigate between
different components.
• React Router uses the history API to manipulate the
browser history.
• It provides a declarative way to handle navigation in
single-page applications.
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9. 9
Styling in React
CSS-in-JS and CSS Modules
• There are several ways to style React components.
• CSS-in-JS libraries like styled-components and emotion
provide a way to write CSS directly in your JavaScript
code.
• CSS Modules allow you to write modular CSS by scoping
styles to specific components.
• Both approaches offer great flexibility and reusability in
styling React components.
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10. 10
State Management with
Redux
Managing Global State in React
• Redux is a predictable state container for JavaScript
applications.
• It provides a central store to manage the global state of
your application.
• Redux follows a unidirectional data flow pattern.
• It is commonly used with React to handle complex state
management.
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11. 11
Testing React
Applications
Unit Testing and Integration Testing
• Testing is an essential part of building reliable React
applications.
• Unit testing allows you to test individual components in
isolation.
• Integration testing ensures that multiple components
work together correctly.
• Tools like Jest and React Testing Library facilitate testing
React applications.
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